Pagination and Filter Configuration Extra for ng-admin+loopback API server

loopback ng-admin pagination and filters

// Pagination and Filter Configuration Extra for ng-admin+loopback API server
// Loopback.io API Mapping
app.config(['RestangularProvider', function (RestangularProvider) {

    function Get(yourUrl){
        var Httpreq = new XMLHttpRequest();
        Httpreq.open("GET",yourUrl,false);
        Httpreq.send(null);
        return Httpreq.responseText;          
    };
    RestangularProvider.addResponseInterceptor(function(data, operation, what, url, response, deferred) {
        if (operation === 'getList') {
            var Result = JSON.parse(Get(url + '/count'));
            response.totalCount = Result.count;
        }
        return data;
    });
        
    // use the custom query parameters function to format the API request correctly
    RestangularProvider.addFullRequestInterceptor(function(element, operation, what, url, headers, params) {
        if (operation === "getList") {
            // custom pagination params
            if (params._page) {
                params['filter[limit]'] = params._perPage;
                params['filter[skip]'] = (params._page - 1) * params._perPage; //skip is the same os offset
                delete params._page;
                delete params._perPage;
            }
            // custom sort params
            if (params._sortField) {
                params['filter[order]']=params._sortField + ' '+ params._sortDir;
                delete params._sortDir;
                delete params._sortField;
            }
            return {params: params};
        }
    });
}]);